Drill sharpener



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DRILL SHARPENER Dec. 27, 1932.

M lka 2620M 6!?64/0'0/0, 23 area 026%015 d @zr oeiziep attouwq Patented Dec. 27, 1932 UNITED SATES PATENT OFFICE GUSTAV C. PEARSON, LORENZO E. CROFT, AND IVAN S. CARPENTER, F DENVER, COLOR-ADO, ASSIGNORS TO GARDNER-DENVER COMPANY, OF DENVER, COLOR-ADO, A

CORPORATION OF DELAW'ARE DRILL SHABPENER Application filed October 31, 1929. Serial No. 403,788.

The object of the present invention is to provide a sharpener that is readily portable and is adaptable for mounting and use on a truck or other vehicle.

Two features are very necessary to secure this object, to-wit, compactness of form and lightness of structure. Therefore an important object of the invention is a novel construction and assembly that has these desirable factors.

In the accompanying drawings:

Fi ure 1 is a side elevation partly in secion of the preferred embodiment of the invention.

Figure 2 is a top plan view of the sharpener.

Figure 3 is a front elevation of the apparatus.

Figure 1- is a sectional view on the line l of Figure 2.

Figure 5 is a plan view of the base member.

Figure 6 is a side elevation of the same.

Figure 7 is a sectional view on the line 'Z'? of Figure 5.

Figure 7a is a detail sectional view on the line 7a7a of Figure 5.

Figure 8 is a detail sectional view showing the means for securing the cylinder to the base ring.

Figure 9 cylinder.

Figure 10 a vertical sectional View through the same, but on a smaller scale.

Figure 11 is a horizontal sectional view on the line 11-11 of Figure 9.

Figures 12, 13 and let are sectional views respectively on the lines 12-12, 13-13 and l t-14 of Figure 11.

Figure 15 is a vertical sectional view through the valve mechanism and showing the same diagrammatically in connection with the piston means in order to illustrate the paths of the motive fluid.

Figures 16 and 17 are vertical sectional views of the valve mechanism showing the same in different positions.

Figure 18 is a plan view of the cylinder head with its lower die member and dolly is a view in elevation of the main I" hammer supporting bracket.

Figure 19 is a sectional view on the line 1919 of Figure 18.

Figure 20 is a detail sectional view on the line 2020 of Figure 18.

In the embodiment disclosed, a base member is employed, comprising a ring 21 and a central upstanding cylinder 22 having an open top, said cylinder rising above the ring and being connected thereto by substantially radial arms 23. The ring has outstanding ears 2% perforated to receive bolts, by which the base can be attached to a truck or other support. The ring furthermore is provided with an upstanding annular flange 25.

Mounted on the ring of this base is a vertically disposed cylinder 26 that surrounds the flange and is secured to the ring by screw bolts 27 passing upwardly through said ring into the lower end of the cylinder. The said cylinder has in its lower portion a vertically disposed piston chamber 28, into which centrally projects the cylinder 22 of the base, and above the chamber 28 there is formed in the cylinder 26 an upper piston chamber 29 of less diameter than the piston chamber 28 and having direct communication therewith. In the piston chambers 28 and 29 is a stepped piston body, preferably of a single piece, the lower and larger diametrical portion 30 of said body operating in the chamber 28 and having an upper fluid pressure surface 31. T he smaller upper portion of the body forms a piston 32 that operates in the smaller piston chamber 29 and has an upper pressure surface 33. The pistons 30-32 are chambered to receive the central base cylinder 22. In said cylinder 22 is a tubular or shell piston 34.- having a closed top 35 that abuts against the underside of the top wall of the piston 32 andacts in opposition to the pistons 3032.

Mounted on the top of the cylinder 26 is a cylinder head 38 secured to the cylinder by bolts 37 (see Figure 1). This cylinder head 36, as shown moreparticularly in Figures 18 and 19, is provided with seats 38 for the reception of dies, shown at 39 in Figure 3. This head also has a rearwardly extending integral bracket 40 for the support of a fluid operated dolly hammer 41. Over the head 36 is a movable die member 42 having dies 1 Motive fluid from any suitable source is brought to the machine and delivered to a nipple l6 formed on one side of the cylinder 26. This nipple is in communication with a supply pasageway 17 formed in the base and leading through one of the arms 23 to the lower end of the cylinder 22, so that the motive fluid acts to move the plston 34: upwardly. From the lower end of the cylinder 22 an other passageway 48 leads through another of the arms 23 and thence upwardly in the wall of the cylinder 26, where it communicates with an annular chamber l9 formed around a valve cage 50. that is placed in a valve casing 51 made upon the cylinder 26. (See Figures 11l2, 15, 16 and 17.) At one side of the chamber 49 there is an annular groove 52 and beyond the annular groove 52 is a second annular groove 53. The groove 52 opens into the top of the piston chamber 29 above the smaller piston 32. The groove 53 opens into the top of the larger piston chamber 28 above the piston 30. The chamber 49 and grooves 52 and 53 have communi- 1 cation with the interior of the valve cage by ports 54. Slidable in the valve cage 50 is a plunger valve having a central reduced neck 55 and end heads 56. This valve is connected by a link 57 with an'actuating lever 58 fulcrumed at its lower end and as shown at 59 to a bracket 60 on the lower end of the cylinder 28. Leading from the valve casing 51 is a conduit 61 that connected to the dolly hammer ll, and this conduit is in communication with the groove 53 by means of a pasageway 62 in which is a controlling valve 63. The valve 63 has a stem 64,0ne end of which projects from the valve casing 51 and into the path of movement of the actuating lever 58.

Assuming that motive fluid is supplied to the nipple 46, it will be evident by reference to Figure 15 that it has constant access to the cylinder 22 and therefore constantly operates against the piston 34 to move it upwardly. The power of the piston is sufiicient to move the main pistons 3032 upwardly, thereby carrying the upper movable die member 42 to open position, or out of coaction with the lower die member. If, now the controlling valve is in its closed position, or as shown in Figure 17, motive fluid passing from the cylinder 22 through the passageway 48, is held against distribution by the valve. If now the valve is moved to the position shown in Figure 16, then the motive fluid can enter the groove 52 and find its way into the upper end of the upper piston chamber 29. Because of the area of this piston, the fluid will cause the same to move downwardly against the action of the piston 34, thereby bringing the upper die member 42 downwardly into coaction with the lower die member. By reciprocating the valve in a restricted operation and only enough to open the groove 52 to the chamber 49 intermittently, and alternately opening the groove 52 to atmosphere through the end of the valve cage by moving the valve to the position shown in Figure 17, the upper die member is reciprocated and can thus be used for forging purposes.

If it is desired to clamp firmly the upper die member on the lower die member or on a tool placed between the two, the valve is thrown to the position shown in Figure 15.

This opens both the grooves and 53 to the supply chamber 4-9 and. motive fluid will enter both the piston chambers 28 and 29, thereby obtaining the pressure of the fluid on both piston areas. A still further movement of. the actuating lever to the right, causes it to strike the stem 64: of the valve 63 so that motive fluid can also flow to the dollyin hammer and cause it to operate upon a tool clamped by the head. lVhen the actuating lever 58 is again. moved to theleft, both the grooves 52 and 53 are opened to atmosphere, allowing the piston chambers 28 and 29 to exhaust and permitting the piston 34. to react and elevate the larger pistons and consequently the upper die member.

It will be noted that this structure is a very compact one inasmuch as the elevating and lowering pistons are nested and furthermore this compact relation is additionally obtained by locating the central cylinder of the base within the main cylinder and with the main cylinder brought down directly on the base ring. At the same time, notwithstanding the compact structure, the effective double pressure obtained by a plurality of clamping pistons is secured. The structure moreover by reason of the nestin of the parts is made relatively light in weight with out sacrificing necessary strength.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What we claim, is:

1. In apparatus of the character set forth, the combination with a supporting spider frame including a peripheral ring and a central cylinder extending above the ring, of a second cylinder based on the ring and surrounding the first cylinder, a piston operating in the second cylinder, relatively movable coacting die members on the second cylinder, a connection between the piston and one of said die members, a piston in the first cylinder acting in opposition to the first mentioned piston, and means for directing inotive fluid against the pistons.

2. In apparatus of the character set forth, the combination with a supporting spider frame including a peripheral ring and a central cylinder extending above the ring, of a second cylinder based on the ring and surrounding the first cylinder, apiston operating in the second cylinder and chambered to receive the first cylinder, relatively movable coacting die members on the second cylinder, a connection between the piston and one of said die members, a piston in the first cylinder acting in opposition to the first mentioned piston, and means for directing motive fluid against the pistons.

3. In apparatus of the character set forth, the combination with a supporting spider frame including a peripheral ring and a central cylinder extending above the ring, of a second cylinder based 011 the ring and surrounding the first cylinder, a piston operating in the second cylinder, relatively movable coacting die members on the second cylinder, a connection between the piston and one of said die members, a piston in the first cylinder acting in opposition to the first mentioned piston, and means for directing motive fluid against the pistons, including a passageway formed in one of the arms of the spider and opening into the first cylinder.

4. In apparatus of the character set forth, the combination with a supporting spider frame including a peripheral ring and a central cylinder extending above the ring, of a second cylinder based on the ring and surrounding the first cylinder, a piston operating in the second cylinder, relatively movable coacting die members one of which is on the second cylinder, a connection between the piston and the other of said die members, a piston in the first cylinder acting in opposition to the first mentioned piston, and means for directing motive fluid against the pistons, including a supply passageway extending through one arm of the spider to the first cylinder, asecond passageway leading from the first cylinder through another arm of the spider for conducting fluid to the second cylinder, and a valve controlling the latter passageway.

5. In apparatus of the character set forth, the combination with a supporting base hav ing a peripheral supporting portion and a central cylinder upstanding above the portion, of a second cylinder mounted on the peripheral portion and having an upper and a lower piston chamber, the latter receiving the first cylinder, stepped pistons in the piston chambers, said pistons being chambered to receive the upstanding cylinder, movable die members on the second cylinder, a connection between the stepped pistons and one of the die members, a piston in the first cylinder operating against the said stepped pistons, and means for directing motive fluid against corresponding faces of the stepped pistons and an opposite face of the last mentioned piston.

6. In apparatus of the character set forth, the combination with a supporting base having a peripheral supporting portion and'a central cylinder upstanding above the portion, of a second cylinder mounted on the peripheral portion and having an upper and a lower piston chamber, the latter receiving the first cylinder, connected pistons in the piston chambers, movable die members one of which is on the second cylinder, a connection between the connected pistons and the other of said die members, a piston in the first cylinder operating against the said connected pistons, and means for directing governed supplies of motive fluid to corresponding faces of one or both of the connected pistons and a supply against an opposite face of the last mentioned piston.

7. In apparatus of the character set forth, the combination with a base comprising a peripheral ring, a central cylinder extending above the ring, and substantially radial arms connecting the ring and cylinder, of a second cylinder mounted on the ring and having upper and lower piston chambers of different diameters, the lower receiving the first cylinder, stepped pistons in the piston chambers of the second cylinder, a piston in the first cylinder, operating against the stepped pistons, an upper head for the second cylinder having a fixed die member thereon, a movable die member cooperating with the fixed die member and connected to the stepped pistons, a motive fluid supply passageway extending through one of the base arms to the first cylinder, a valve mechanism on the second cylinder, passageways governed by the valve mechanism leading to the piston chambers, and a motive supply passageway leading from the first cylinder to the valve mechanism.

In testimony whereof, we afiix our signatures.

GUSTAV C. PEARSON. LORENZO E. CROFT. IVAN S. CARPENTER. 

